functions/Remove-DbaDbTableData.ps1
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function Remove-DbaDbTableData { <# .SYNOPSIS Removes table data using a batch technique. Databases in both on-prem SQL Server and Azure SQL Database are supported. .DESCRIPTION This command does a batch delete of table data using the technique described by Aaron Bertrand here: https://sqlperformance.com/2013/03/io-subsystem/chunk-deletes. The main goal of this command is to ensure that the log file size is controlled while deleting data. This command can be used for doing both very large deletes or small deletes. Foreign keys are not temporarily removed, so the caller needs to perform deletes in the correct order with dependent tables or enable cascading deletes. When a database is using the full or bulk_logged recovery model this command will take log backups at the end of each batch if the -LogBackupPath or -AzureBaseUrl param is specified. If the database is using the simple recovery model then CHECKPOINTs will be performed for on-prem SQL Server databases. The object returned will contain metadata about the batch deletion process including the log backup details. There are two categories of use cases for this command: 1. Simplistic deletions from a table. In this scenario use the -Table and -BatchSize parameters. The DELETE statement is auto-generated by the this command. 2. Complex deletions based on a join, where clause, or an order by clause. In this scenario use the -DeleteSql parameter to specify the DELETE statement. .PARAMETER SqlInstance The target SQL Server instance or instances. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential). Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported. For MFA support, please use Connect-DbaInstance. .PARAMETER Database The database(s) to process. This list is auto-populated from the server. If unspecified, all user databases will be processed. .PARAMETER BatchSize The number of rows to delete per batch. This param is defaulted to 100000 and limited to a value between 1 and 1000000000 (1 billion). This param can only be used with the -Table param. If -DeleteSql is used the TOP (N) clause must be specified in the SQL DELETE string. Note: for Azure SQL databases error 40552 could occur for large batch deletions: https://docs.microsoft.com/en-us/azure/azure-sql/database/troubleshoot-common-errors-issues#error-40552-the-session-has-been-terminated-because-of-excessive-transaction-log-space-usage .PARAMETER Table The name of the table that data should be deleted. This param is required except when -DeleteSql is specified. When this param is used the -BatchSize param may also be used (or its default value). .PARAMETER DeleteSql A SQL DELETE statement to be used in the command's loop for more advanced scenarios such as deleting based on a join, using a where clause, or using an order by clause (or a combination of all of those). It is required that the DELETE statement include the TOP (N) clause. See the example below. This param may be used instead of -Table and -BatchSize. .PARAMETER LogBackupPath The directory to store the log backups. This command creates log backups when the database is using the full or bulk_logged recovery models and is an on-prem SQL server instance. If this param is not provided the command will not take log backups. This directory should be writeable by the SQL Server service account. .PARAMETER LogBackupTimeStampFormat By default the command timestamps the log backup files using the format yyyyMMddHHmm. The timestamp format should be defined using the Get-Date formats, because illegal formats will cause an error to be thrown. .PARAMETER AzureBaseUrl Used for log backups. See https://dbatools.io/Backup-DbaDatabase for information on this parameter. This function invokes Backup-DbaDatabase with -AzureBaseUrl if it is provided. .PARAMETER AzureCredential Used for log backups. See https://dbatools.io/Backup-DbaDatabase for information on this parameter. This function invokes Backup-DbaDatabase with -AzureCredential if it is provided. .PARAMETER InputObject Enables piped input of Microsoft.SqlServer.Management.Smo.Database, Microsoft.SqlServer.Management.Smo.Server, and Sqlcollaborative.Dbatools.Parameter.DbaInstanceParameter objects. .PARAMETER EnableException By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message. This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting. Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch. .PARAMETER WhatIf Shows what would happen if the command were to run. No actions are actually performed. .PARAMETER Confirm Prompts for confirmation before executing any data modification operations. .NOTES Tags: Table, Data Author: Adam Lancaster https://github.com/lancasteradam Website: https://dbatools.io Copyright: (c) 2020 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT Reference material used: https://sqlperformance.com/2013/03/io-subsystem/chunk-deletes by Aaron Bertrand .LINK https://dbatools.io/Remove-DbaDbTableData .EXAMPLE PS C:\> Remove-DbaDbTableData -SqlInstance localhost -Database TestDb -Table dbo.Test -BatchSize 1000000 -LogBackupPath E:\LogBackups -Confirm:$false Removes all data from the dbo.Test table in the TestDb database on the local SQL instance. The deletes are done in batches of 1000000 rows each and the log backups are written to E:\LogBackups. .EXAMPLE PS C:\> Remove-DbaDbTableData -SqlInstance localhost -Database TestDb -DeleteSql "DELETE TOP (1000000) deleteFromTable FROM dbo.Test deleteFromTable LEFT JOIN dbo.Test2 b ON deleteFromTable.Id = b.Id" -LogBackupPath E:\LogBackups -Confirm:$false Removes data from the dbo.Test table in the TestDb database on the local SQL instance. When specifying -DeleteSql the DELETE statement needs to specify the TOP (N) clause. In this example the deletes are done in batches of 1000000 rows each and the log backups are written to E:\LogBackups. .EXAMPLE PS C:\> Remove-DbaDbTableData -SqlInstance localhost -Database TestDb -Table dbo.Test -DeleteSql "WITH ToDelete AS (SELECT TOP (1000000) Id FROM dbo.Test ORDER BY Id DESC;) DELETE FROM ToDelete;" -LogBackupPath E:\LogBackups -Confirm:$false Removes data from the dbo.Test table based on the DELETE statement specified in the -DeleteSql. The deletes occur in the TestDb database on the local SQL instance. The deletes are done in batches of 1000000 rows each and the log backups are written to E:\LogBackups. .EXAMPLE PS C:\> Get-DbaDatabase -SqlInstance localhost -Database TestDb1, TestDb2 | Remove-DbaDbTableData -Table dbo.Test -BatchSize 1000000 -LogBackupPath E:\LogBackups -Confirm:$false Removes data from the dbo.Test table in the TestDb1 and TestDb2 databases on the local SQL instance. The deletes are done in batches of 1000000 rows each and the log backups are written to E:\LogBackups. .EXAMPLE PS C:\> $server, $server2 | Remove-DbaDbTableData -Database TestDb -Table dbo.Test -BatchSize 1000000 -LogBackupPath E:\LogBackups -Confirm:$false Removes data from the dbo.Test table in the TestDb database on the SQL instances represented by $server and $server2. The deletes are done in batches of 1000000 rows each and the log backups are written to E:\LogBackups. .EXAMPLE PS C:\> $server = Connect-DbaInstance -ConnectionString "Data Source=TCP:yourserver.database.windows.net,1433;MultipleActiveResultSets=False;Connect Timeout=30;Encrypt=True;TrustServerCertificate=False;User Id=dbuser;Password=strongpassword;Database=TestDb" Remove-DbaDbTableData -SqlInstance $server -Database TestDb -Table dbo.Test -BatchSize 1000000 -Confirm:$false Removes data from the dbo.Test table in the TestDb database on the Azure SQL server yourserver.database.windows.net. The deletes are done in batches of 1000000 rows. Log backups are managed by Azure SQL. Note: for Azure SQL databases error 40552 could occur for large batch deletions: https://docs.microsoft.com/en-us/azure/azure-sql/database/troubleshoot-common-errors-issues#error-40552-the-session-has-been-terminated-because-of-excessive-transaction-log-space-usage #> [CmdletBinding(SupportsShouldProcess, ConfirmImpact = 'High')] param ( [DbaInstance[]]$SqlInstance, [PSCredential]$SqlCredential, [string[]]$Database, [ValidateRange(1, 1000000000)][int]$BatchSize = 100000, [string]$Table, [string]$DeleteSql, [string]$LogBackupPath, [string]$LogBackupTimeStampFormat, [string[]]$AzureBaseUrl, [string]$AzureCredential, [parameter(ValueFromPipeline)] [object[]]$InputObject, [switch]$EnableException ) begin { if ((Test-Bound Table) -and (Test-Bound DeleteSql)) { Stop-Function -Message "You must specify either -Table or -DeleteSql, but not both. See the command description for more details." return } if (-not $Table -and -not $DeleteSql) { Stop-Function -Message "You must specify either -Table or -DeleteSql. See the command description for more details." return } if ((Test-Bound BatchSize) -and (Test-Bound DeleteSql)) { Stop-Function -Message "When using -DeleteSql the -BatchSize param cannot be used. See the command description for more details." return } if ((Test-Bound LogBackupPath) -and (Test-Bound AzureBaseUrl)) { Stop-Function -Message "You must specify either -LogBackupPath or -AzureBaseUrl, but not both. See the command description for more details." return } if (Test-Bound DeleteSql) { if ($DeleteSql -inotmatch "top") { Stop-Function -Message "To use the -DeleteSql param you must specify the TOP (N) clause in the DELETE statement. See the command description for more details." return } if ($DeleteSql -inotmatch "delete") { Stop-Function -Message "The -DeleteSql param must be a DELETE statement with a TOP (N) clause. See the command description for more details." return } } if (-not (Test-Bound 'LogBackupTimeStampFormat')) { Write-Message -Message 'Setting Default LogBackupTimeStampFormat' -Level Verbose $LogBackupTimeStampFormat = "yyyyMMddHHmm" } # build the delete statement based on the caller's parameters $sql = " SET DEADLOCK_PRIORITY LOW; SET NOCOUNT ON; SET XACT_ABORT ON; DECLARE @RowCount INTEGER = 0 , @ErrorMessage NVARCHAR(MAX) = NULL; BEGIN TRANSACTION; BEGIN TRY " if (Test-Bound Table) { $sql += " DELETE TOP ($BatchSize) FROM $Table;" } elseif (Test-Bound DeleteSql) { $sql += " $DeleteSql;" } $sql += " SET @RowCount = @@ROWCOUNT; COMMIT TRANSACTION; END TRY BEGIN CATCH SET @ErrorMessage = 'Error number = ' + CAST(ERROR_NUMBER() AS NVARCHAR(MAX)) + ', Severity = ' + CAST(ERROR_SEVERITY() AS NVARCHAR(MAX)) + ', Line = ' + CAST(ERROR_LINE() AS NVARCHAR(MAX)) + ', Message = ' + CAST(ERROR_MESSAGE() AS NVARCHAR(MAX)); IF @@TRANCOUNT > 0 ROLLBACK TRANSACTION; END CATCH; SELECT @RowCount AS [RowCount] , @ErrorMessage AS ErrorMessage;" } process { if (Test-FunctionInterrupt) { return } if (-not $InputObject -and -not $SqlInstance) { Stop-Function -Message "You must specify a SqlInstance or pipe in a database or a server. See the command description." return } if ($SqlInstance) { $InputObject = $SqlInstance } foreach ($input in $InputObject) { $inputType = $input.GetType().FullName switch ($inputType) { # get the db(s) based on the caller's parameters 'Sqlcollaborative.Dbatools.Parameter.DbaInstanceParameter' { Write-Message -Level Verbose -Message "Processing DbaInstanceParameter through InputObject" $dbDatabases = Get-DbaDatabase -SqlInstance $input -SqlCredential $SqlCredential -Database $Database -ExcludeSystem } 'Microsoft.SqlServer.Management.Smo.Server' { Write-Message -Level Verbose -Message "Processing Server through InputObject" $dbDatabases = Get-DbaDatabase -SqlInstance $input -SqlCredential $SqlCredential -Database $Database -ExcludeSystem } 'Microsoft.SqlServer.Management.Smo.Database' { Write-Message -Level Verbose -Message "Processing Database through InputObject" $dbDatabases = $input | Where-Object { -not $_.IsSystemObject } } default { Stop-Function -Message "InputObject is not a server or database. See the command description for examples." return } } foreach ($db in $dbDatabases) { $server = $db.Parent if (Test-Bound LogBackupPath -and $server.DatabaseEngineType -ne "SqlAzureDatabase") { $pathCheck = Test-DbaPath -SqlInstance $server -Path $LogBackupPath if (-not $pathCheck) { Stop-Function -Message "The service account for $server is not able to create log backups in $LogBackupPath." return } } # warn the caller if the database is using one of these configurations for on-prem if ($server.DatabaseEngineType -ne "SqlAzureDatabase") { $isDbLogShipping = $db.Query("SELECT COUNT(1) FROM msdb.dbo.log_shipping_monitor_primary WHERE primary_database = '$($db.Name)'") if ($isDbLogShipping -eq 1) { Write-Message -Level Warning -Message "$($db.Name) is the primary db in a log shipping configuration. Be sure to re-sync after this command completes." } if ($db.IsMirroringEnabled) { Write-Message -Level Warning -Message "$($db.Name) is configured for mirroring. Be sure to validate the mirror is synchronized after this command completes." } if (-not [string]::IsNullOrEmpty($db.AvailabilityGroupName)) { Write-Message -Level Warning -Message "$($db.Name) is part of an availability group. Be sure to validate the secondary database(s) is synchronized after this command completes." } } if ($Pscmdlet.ShouldProcess($db.Name, "Removing data using $sql on $($db.Parent.Name)")) { # metadata to collect while running the loop $totalRowsDeleted = 0 $totalTimeMillis = 0 $iterationCount = 0 $logBackupsArray = @() $timingsArray = @() do { $rowCount = 0 try { $commandTiming = Measure-Command { $result = $db.Query($sql) } # Check if a runtime error occurred during the delete. Malformed SQL errors skip over this and end up in the catch block below. if (-not [string]::IsNullOrEmpty($result.ErrorMessage)) { throw $result.ErrorMessage } $rowCount = $result.RowCount if ($rowCount -gt 0) { # rows were deleted on the last statement execution, so collect the metadata and print out a verbose message. $totalRowsDeleted += $rowCount $timingsArray += $commandTiming $totalTimeMillis += $commandTiming.TotalMilliseconds Write-Message -Level Verbose -Message "Iteration $iterationCount took $($commandTiming.TotalMilliseconds) milliseconds to remove $rowCount rows" } } catch { Stop-Function -Message "Error removing data from $Table $DeleteSql using $sql on $($db.Parent.Name)" -ErrorRecord $_ return } if ($rowCount -gt 0) { $iterationCount += 1 #If the db is in Azure then we won't do a checkpoint or a log backup since those are automatically managed. if ($server.DatabaseEngineType -ne "SqlAzureDatabase") { if ($db.RecoveryModel -eq "Simple") { try { $checkPointResult = $db.Query("CHECKPOINT") if (-not [string]::IsNullOrEmpty($checkPointResult.ErrorMessage)) { throw $checkPointResult.ErrorMessage } } catch { Stop-Function -Message "Error during checkpoint on $($db.Parent.Name)" -ErrorRecord $_ return } } else { # bulk-logged or full recovery model if (Test-Bound LogBackupPath) { $timestamp = Get-Date -Format $LogBackupTimeStampFormat $logBackupsArray += Backup-DbaDatabase -SqlInstance $server -Database $db.Name -Type Log -FilePath "$LogBackupPath\$($db.Name)_$($timestamp)_$($iterationCount).trn" } elseif (Test-Bound AzureBaseUrl) { $logBackupsArray += Backup-DbaDatabase -SqlInstance $server -Database $db.Name -Type Log -AzureBaseUrl $AzureBaseUrl -AzureCredential $AzureCredential } } } } if (Test-FunctionInterrupt) { return } } while ($rowCount -gt 0) [pscustomobject]@{ ComputerName = $db.Parent.ComputerName InstanceName = $db.Parent.Name Database = $db.Name Sql = $sql TotalRowsDeleted = $totalRowsDeleted Timings = $timingsArray TotalTimeMillis = $totalTimeMillis AvgTimeMillis = $totalTimeMillis / $(if ($iterationCount -le 0) { 1 } else { $iterationCount }) TotalIterations = $iterationCount LogBackups = $logBackupsArray } | Select-DefaultView -Property "ComputerName", "InstanceName", "Database", "Sql", "TotalRowsDeleted", "TotalTimeMillis", "AvgTimeMillis", "TotalIterations" } } } } } # 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